Don't look down on the evaporator, though it appears to be just a tube, lined with tubes, and the layman can't see where the technology is. Evaporator technology key point lies in: one is the material, to achieve the exchange of hot and cold best effect, you must use conductive materials, so that the condensation liquid through the evaporator into cold air flows through the tubes, has been formed and the pipe flow through the hot gas conduction, such gases in pipe to reduce heat, low temperature, the gas in the evaporator liquid, evaporator and the cooling fluid to switch back and forth between gas and liquid.